Celtic coins are a bit of a weak spot, and when I can buy them with find location from a metal-detectorist, I usually do (especially if the price is right, being a Dutch cheapskate). All coins were found near Amiens, France. A few weeks ago, I bought his newest finds, and posted some here. Three have remained unidentified, and I would appreciate any help in the right direction. First: the entire Celtic coinage in one coin: a head with annulets and a horse with annulets. These search terms are really not helpful. Weight c. 3.1g; diamter c. 17mm. Nice, glossy green patina, which is super difficult to photograph. Second: really, what is that thing on the reverse? A funny coin (with @AnYangMan joking that only the mother of this long-deceased fellow would have liked his looks). But what are we looking at on the reverse? is it a castle? That's very unceltic. Should it be rotated 90 degrees? Diameter c. 18 mm Last, this off-center funny looking head. A double dotted circle around, which is unusual for ancients (wasn't there a thread about that recently?) On the reverse, a horse to the left, and what seems to be a legend. Intriguing coin as well. Diameter c. 17 mm; weight 2.5 if I remember correctly. Then the coins that I managed to ID myself: Bituriges region; head to the left with curly hair // horse to the left with three pellets-within-annulet above. 80-50 bc CELTS, Nervii. Denomination: AE Potin, minted: Nervii, current Belgium; c. 100 BC Obv: Stylized horse to the right, pellets around Rev: Vertical axis, formed of six or seven globules, approached by four wavy strands on either side; peripheral bead Weight: 5.39g; Ø:19mm. Catalogue: DT.629, LT.8620. Provenance: Found near Amiens, France; acq.: 08-2020 R1. Deep grey patina, minor pitting on the obverse. Carnutes, quite a recognizable coin with the silly looking fellow on the obverse and the eagle/crow on the reverse (which carries something in its hands) CELTS, Carnutes. Denomination: AE Unit, minted: Carnutes, Beauce region, France; 40-30 BC Obv: Diademed female head to the left. Rev: Wolf to the left turning his head back towards a lizard seen from above, horizontal line below Weight: 3.7g; Ø:16mm. Catalogue: ABT.272 - RIG.224 g - Sch/L.775-776. Provenance: Found near Amiens, France; acq.: 08-2020 R1, dark green to grey patina with some pitting, mainly on the obverse. CELTS, Germanus Indutilli Libertalis. Denomination: AE Semis, minted: Gallia Belgica; c. 27 BC to 14 AD Obv: Diademed head of Germanus Indutilli to the right Rev: GERMANVS (above) INVTILLI L (in exergue) Bull trampling to the left Weight: 2.94g; Ø:16mm. Catalogue: RPC I 506; RIC I 249. Provenance: Found near Amiens, France; acq.: 08-2020
Your first coin looks like a Catuslugi coin "VIIRICIVS, classe III". See here and here. LT.8554, DT.507. My best guess for your second coin in DT 695, a Bellovaci coin "imitation de l'autel de Lyon, 'type de Vendeuil-Caply'". It's not quite correct, but it's probably something from the same tribe.
Thanks @DCCR, it is spot on! Did you recognize them? If not, what was your search strategy? The main characteristic are very broad (i.e. horse, annulet, head, etc). Also, do you have a clue about the last one?
The last one is also a Cataslugi coin - "VIIRICIVS, classe II". DT.506. See here and here for examples. I recognised the first coin because I had been looking at Cataslugi coins about an hour before I saw your post and I remembered the shape under the horse. I found the second one by flicking through the plates in DT. It's at the bottom of the last page, which is where I started, and the reverse is distinctive. The third one took longer, but was still just flicking through DT, checking on the CGBFR archive for that type, then doing a die comparison in Photoshop to be sure. I've found that doing a textual search for celtic coins is a waste of time. Horse, head, wreath, pellet, ring, line. Despite all of their coins being very diverse, they used the same basic elements all the time so it's really hard to get anywhere without just looking at pictures.